ms_power.m

MatLab图像传感器网络仿真平台WiSNAP

function status = ms_power(port,state);
%Mouse sensor power up/down.
%   STATUS = MS_POWER(PORT,STATE);
%
%   Input Parameters:
%   ================
%
%      port --------------> Parallel port base address decimal (positive integer).
%      state -------------> Mouse sensor power state (integer):
%                           0 - power down.
%                           1 - power up.
%
%   Output Parameters:
%   =================
%
%      status ------------> Success status (-1 = error, +1 = success).
%
%   See also MS_FRAME, MS_RESET.

% Stephan Hengstler
% Stanford Wireless Sensor Networks Lab
% January 07, 2005
%
% Last modified: 01-21-2005
% .MEX C Source: ms_power.c

%****************************** Mouse Sensor Power Up/Down ********************************

% define port addresses
DATA_PORT   = port;
STAT_PORT   = DATA_PORT + 1;
CTRL_PORT   = DATA_PORT + 2;

% define signal bit masks
MASK_NCS    = 2;
MASK_NPD    = 3;
MASK_MOSI   = 1;
MASK_MISO   = 8;
MASK_RESET  = 4;
MASK_SCLK   = 1;

% set direction out
ctrl_value  = inp32(CTRL_PORT);
ctrl_value  = bitset(ctrl_value,6,0);

% clear reset
ctrl_value  = bitset(ctrl_value,MASK_RESET,1);

% valid power state?
if ((state == 0) | (state == 1))

   % set power state
   ctrl_value  = bitset(ctrl_value,MASK_NPD,state);
   out32(CTRL_PORT,ctrl_value)

   % insert delay per data sheet after power up
   if (state == 1)
      pause(590e-6)
   end

   % return status
   status      = 1;

% unknown power state?
else
   
   % return status
   status      = -1;
   
end